#include <algorithm>
#include <cstdint>
#include <iostream>
#include <vector>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <fstream>
#include <fcntl.h>

#include "acl/acl.h"
#include "aclnn_leaky_relu_grad_custom.h"  

#define SUCCESS 0
#define FAILED 1

#define INFO_LOG(fmt, args...) fprintf(stdout, "[INFO]  " fmt "\n", ##args)
#define WARN_LOG(fmt, args...) fprintf(stdout, "[WARN]  " fmt "\n", ##args)
#define ERROR_LOG(fmt, args...) fprintf(stderr, "[ERROR]  " fmt "\n", ##args)

#define CHECK_RET(cond, return_expr) \
    do {                             \
        if (!(cond)) {               \
            return_expr;             \
        }                            \
    } while (0)

#define LOG_PRINT(message, ...)         \
    do {                                \
        printf(message, ##__VA_ARGS__); \
    } while (0)

bool ReadFile(const std::string &filePath, size_t fileSize, void *buffer, size_t bufferSize)
{
    struct stat sBuf;
    int fileStatus = stat(filePath.data(), &sBuf);
    if (fileStatus == -1) {
        ERROR_LOG("failed to get file %s", filePath.c_str());
        return false;
    }
    if (S_ISREG(sBuf.st_mode) == 0) {
        ERROR_LOG("%s is not a file, please enter a file", filePath.c_str());
        return false;
    }

    std::ifstream file;
    file.open(filePath, std::ios::binary);
    if (!file.is_open()) {
        ERROR_LOG("Open file failed. path = %s", filePath.c_str());
        return false;
    }

    std::filebuf *buf = file.rdbuf();
    size_t size = buf->pubseekoff(0, std::ios::end, std::ios::in);
    if (size == 0) {
        ERROR_LOG("file size is 0");
        file.close();
        return false;
    }
    if (size > bufferSize) {
        ERROR_LOG("file size is larger than buffer size");
        file.close();
        return false;
    }
    buf->pubseekpos(0, std::ios::in);
    buf->sgetn(static_cast<char *>(buffer), size);
    fileSize = size;
    file.close();
    return true;
}

bool WriteFile(const std::string &filePath, const void *buffer, size_t size)
{
    if (buffer == nullptr) {
        ERROR_LOG("Write file failed. buffer is nullptr");
        return false;
    }

    int fd = open(filePath.c_str(), O_RDWR | O_CREAT | O_TRUNC, S_IRUSR | S_IWRITE);
    if (fd < 0) {
        ERROR_LOG("Open file failed. path = %s", filePath.c_str());
        return false;
    }

    auto writeSize = write(fd, buffer, size);
    (void) close(fd);
    if (writeSize != size) {
        ERROR_LOG("Write file Failed.");
        return false;
    }

    return true;
}

int64_t GetShapeSize(const std::vector<int64_t> &shape)
{
    int64_t shapeSize = 1;
    for (auto i : shape) {
        shapeSize *= i;
    }
    return shapeSize;
}

int Init(int32_t deviceId, aclrtStream *stream)
{
    // 固定写法，acl初始化
    auto ret = aclInit(nullptr);
    CHECK_RET(ret == ACL_SUCCESS, LOG_PRINT("aclInit failed. ERROR: %d\n", ret); return FAILED);
    ret = aclrtSetDevice(deviceId);
    CHECK_RET(ret == ACL_SUCCESS, LOG_PRINT("aclrtSetDevice failed. ERROR: %d\n", ret); return FAILED);
    ret = aclrtCreateStream(stream);
    CHECK_RET(ret == ACL_SUCCESS, LOG_PRINT("aclrtCreateStream failed. ERROR: %d\n", ret); return FAILED);

    return SUCCESS;
}

template <typename T>
int CreateAclTensor(const std::vector<T> &hostData, const std::vector<int64_t> &shape, void **deviceAddr,
                    aclDataType dataType, aclTensor **tensor)
{
    auto size = GetShapeSize(shape) * sizeof(T);
    // 调用aclrtMalloc申请device侧内存
    auto ret = aclrtMalloc(deviceAddr, size, ACL_MEM_MALLOC_HUGE_FIRST);
    CHECK_RET(ret == ACL_SUCCESS, LOG_PRINT("aclrtMalloc failed. ERROR: %d\n", ret); return FAILED);

    // 调用aclrtMemcpy将host侧数据拷贝到device侧内存上
    ret = aclrtMemcpy(*deviceAddr, size, hostData.data(), size, ACL_MEMCPY_HOST_TO_DEVICE);
    CHECK_RET(ret == ACL_SUCCESS, LOG_PRINT("aclrtMemcpy failed. ERROR: %d\n", ret); return FAILED);

    // 调用aclCreateTensor接口创建aclTensor
    *tensor = aclCreateTensor(shape.data(), shape.size(), dataType, nullptr, 0, aclFormat::ACL_FORMAT_ND, shape.data(),
                              shape.size(), *deviceAddr);
    return SUCCESS;
}

int main(int argc, char **argv)
{
    // 1. （固定写法）device/stream初始化, 参考acl对外接口列表
    // 根据自己的实际device填写deviceId
    int32_t deviceId = 0;
    aclrtStream stream;
    auto ret = Init(deviceId, &stream);
    CHECK_RET(ret == 0, LOG_PRINT("Init acl failed. ERROR: %d\n", ret); return FAILED);

    // 2. 构造输入与输出，需要根据API的接口自定义构造
    std::vector<int64_t> inputDyShape = {13, 3333};  // 修改为LeakyReluGrad的输入形状
    std::vector<int64_t> inputXShape = {13, 3333};   // 修改为LeakyReluGrad的输入形状
    std::vector<int64_t> outputDxShape = {13, 3333}; // 修改为LeakyReluGrad的输出形状
    void *inputDyDeviceAddr = nullptr;              // 修改变量名
    void *inputXDeviceAddr = nullptr;
    void *outputDxDeviceAddr = nullptr;             // 修改变量名
    aclTensor *inputDy = nullptr;                   // 修改变量名
    aclTensor *inputX = nullptr;
    aclTensor *outputDx = nullptr;                  // 修改变量名
    
    size_t inputDyShapeSize = inputDyShape[0] * inputDyShape[1];  // 修改变量名
    size_t inputXShapeSize = inputXShape[0] * inputXShape[1];
    size_t outputDxShapeSize = outputDxShape[0] * outputDxShape[1]; // 修改变量名
    
    std::vector<float> inputDyHostData(inputDyShape[0] * inputDyShape[1]);  // 修改变量名
    std::vector<float> inputXHostData(inputXShape[0] * inputXShape[1]);
    std::vector<float> outputDxHostData(outputDxShape[0] * outputDxShape[1]); // 修改变量名
    
    size_t dataType = sizeof(float);
    size_t fileSize = 0;
    
    void ** inputDyData = (void **)(&inputDyHostData);  // 修改变量名
    void ** inputXData = (void **)(&inputXHostData);
    
    // 读取数据，修改文件路径和变量名
    ReadFile("../input/input_dy.bin", fileSize, *inputDyData, inputDyShapeSize * dataType);  // 修改文件路径和变量名
    ReadFile("../input/input_x.bin", fileSize, *inputXData, inputXShapeSize * dataType);

    INFO_LOG("Set input success");
    
    // 创建inputDy aclTensor，修改变量名
    ret = CreateAclTensor(inputDyHostData, inputDyShape, &inputDyDeviceAddr, aclDataType::ACL_FLOAT, &inputDy);  // 修改变量名
    CHECK_RET(ret == ACL_SUCCESS, return FAILED);
    // 创建inputX aclTensor
    ret = CreateAclTensor(inputXHostData, inputXShape, &inputXDeviceAddr, aclDataType::ACL_FLOAT, &inputX);
    CHECK_RET(ret == ACL_SUCCESS, return FAILED);
    // 创建outputDx aclTensor，修改变量名
    ret = CreateAclTensor(outputDxHostData, outputDxShape, &outputDxDeviceAddr, aclDataType::ACL_FLOAT, &outputDx);  // 修改变量名
    CHECK_RET(ret == ACL_SUCCESS, return FAILED);
    // 3. 调用CANN自定义算子库API，修改为LeakyReluGrad相关的函数
    float negativeSlope = 0.1;
    uint64_t workspaceSize = 0;
    aclOpExecutor *executor;
    
    // 计算workspace大小并申请内存，修改函数名
    ret = aclnnLeakyReluGradCustomGetWorkspaceSize(inputDy, inputX, negativeSlope, outputDx, &workspaceSize, &executor);  
    CHECK_RET(ret == ACL_SUCCESS, LOG_PRINT("aclnnLeakyReluGradCustomGetWorkspaceSize failed. ERROR: %d\n", ret); return FAILED);
    
    void *workspaceAddr = nullptr;
    if (workspaceSize > 0) {
        ret = aclrtMalloc(&workspaceAddr, workspaceSize, ACL_MEM_MALLOC_HUGE_FIRST);
        CHECK_RET(ret == ACL_SUCCESS, LOG_PRINT("allocate workspace failed. ERROR: %d\n", ret); return FAILED;);
    }
    
    // 执行算子，修改函数名
    ret = aclnnLeakyReluGradCustom(workspaceAddr, workspaceSize, executor, stream);  
    if (ret != ACL_SUCCESS) {
    const char* errorMsg = aclGetRecentErrMsg();
    LOG_PRINT("aclnnLeakyReluGradCustom failed. ERROR: %d, Error Message: %s\n", ret, errorMsg);
    return FAILED;
    }
    CHECK_RET(ret == ACL_SUCCESS, LOG_PRINT("aclnnLeakyReluGradCustom failed. ERROR: %d\n", ret); return FAILED);

    // 4. （固定写法）同步等待任务执行结束
    ret = aclrtSynchronizeStream(stream);
    if (ret != ACL_SUCCESS) {
    const char* errorMsg = aclGetRecentErrMsg();
    LOG_PRINT("aclrtSynchronizeStream failed. ERROR: %d, Error Message: %s\n", ret, errorMsg);
    return FAILED;
    }
    CHECK_RET(ret == ACL_SUCCESS, LOG_PRINT("aclrtSynchronizeStream failed. ERROR: %d\n", ret); return FAILED);

    // 5. 获取输出的值，将device侧内存上的结果拷贝至host侧，修改变量名
    auto size = GetShapeSize(outputDxShape);  // 修改变量名
    std::vector<float> resultData(size, 0);
    ret = aclrtMemcpy(resultData.data(), resultData.size() * sizeof(resultData[0]), outputDxDeviceAddr,  // 修改变量名
                      size * sizeof(float), ACL_MEMCPY_DEVICE_TO_HOST);
    CHECK_RET(ret == ACL_SUCCESS, LOG_PRINT("copy result from device to host failed. ERROR: %d\n", ret); return FAILED);
    
    void ** outputData = (void **)(&resultData);
    
    // 写出数据，修改文件路径和变量名
    WriteFile("../output/output_dx.bin", *outputData, outputDxShapeSize * dataType);  // 修改文件路径和变量名
    INFO_LOG("Write output success");

    // 6. 释放aclTensor，修改变量名
    aclDestroyTensor(inputDy);  // 修改变量名
    aclDestroyTensor(inputX);
    aclDestroyTensor(outputDx); // 修改变量名

    // 7. 释放device资源，修改变量名
    aclrtFree(inputDyDeviceAddr);  // 修改变量名
    aclrtFree(inputXDeviceAddr);
    aclrtFree(outputDxDeviceAddr); // 修改变量名
    
    if (workspaceSize > 0) {
        aclrtFree(workspaceAddr);
    }
    
    aclrtDestroyStream(stream);
    aclrtResetDevice(deviceId);
    aclFinalize();
    return SUCCESS;
}